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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ecc010ce4421dfa529db02e0f221e1aa41219bd0e35af9032338ef322a3f4fd3' 
  AND token = 'G9BYU5RMrBXFoQDm8knPYS+IZWB7en9e+8kZZJoNihQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00012

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}