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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cca20336c27e215fa8135270d97ec389271455efc4a2f05b3772b5add3ab7146' 
  AND token = 'XGnAHRru0ymo1djASUB+uPaAGFTRhcykpEZF+lXir2I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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