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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '074c5c2ecadb127e3ac99a92956ef64ae813a3da20830777f809bdb987cba371' 
  AND token = 'W0E68UuG9lFrQwQmrO/m9l11gm5R3pq1jUBXpjnOxMA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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