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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cde98e9369eb3eb314b0d41ab7b0fbe7d69469d2bf9a1103c6bd51312fabdf9d' 
  AND token = '/Bu2q0q/bIyfBC7BwhV1L0q3Fug/H21GtF6s7OlUjtc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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