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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f8fe3ac0f254893e0593067838bab14778f70452a0ea99ddced1f5adbc5600c' 
  AND token = 'm7CURVf7aI1Nn7R2m4YBQeyQdpImDonO3udrGUAOdws=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00009

JSON explain

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