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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19b16ff0b5fa280e870516c3897c10e792135b814252f2a20dc2323abd545ff6' 
  AND token = '7Oko0uDvbzhY55UcBLQ3+SsXYmG5kg8YbRwenyzPodo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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