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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b696b36a3a929c52dc46399aaf065c56207f66636299b33791484ba1d6e6f043' 
  AND token = 'lhudSDKxr1dsmqAM+jd83bqrK4PvS5yipUBD+nfYrbc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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