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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a1954cb959a555aa8e42cf5387bae2f1632b56df0fae08e1f104480a42fa370a' 
  AND token = 'pgJgnGSSMrmx+s3x2gXj5JQ0NeevOPzXwtNNKec+V1c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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