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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07b97fa76f003eb9fade415028ceb5350ebda3c5544abf67b7f28c5ac961b144' 
  AND token = 'TarrvqDj1UFuJldT/C6moShxWFXIzgRezWJIWbr9+lE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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