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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b64b90d5cabf5de6e196632eef45e52dc9f87db098b836d7ed3a5aeee6b607fe' 
  AND token = 'YD1Kaj+XE/vZnd95q0wLTWpmi7dHF3nyVqIuEu/4QAc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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