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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e4dcbbf3bcb2784840da25ed45cf9216096f22fb3d383611df1937328927a567' 
  AND token = '5/+2ZpEmWS79x7Nglti1iVM7+E++97yZPGZlsqH48fc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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