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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c86ce2db78e3e1391a97e1472ac2c305a1962e58cef81c0c742be6d5f0163ca6' 
  AND token = '68OAayiIdw3tFFWc3CLQixt+Bky3az8j8B8+8ohvL0E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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