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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6bb483ba85adb00ed132039eb0f27437002ac13c18bb7b2ab479197f055eb06a' 
  AND token = 'SlWJrZJJ3VSAgjuq9jw/Nsx5i8uaNkfPE/7UcfT6g78=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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