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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b8e2e68fae4bd9261bbe9bc59a4a0b834878f946b0897184c8d04e3f06e213b4' 
  AND token = 'TNu8kdHxQ8l0IjomYnsm8iGW8MUkvKtYoFX639PzRqk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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