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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf82b0333753f97052bc74b3cae35f74bd922f87a35c865eb4a49544a879a3a9' 
  AND token = '2QfDLkZAb1g1g+RFvPypq3IK0npk8wv7xN16CP+94tM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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