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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '53fdd990700097fc0d0f6c88c176e4e5794cf1b6ff3d64a72820aac633ae006e' 
  AND token = 'a4LkHbtHHxG9At6cdwfnfYbRWGAzLry0M8JKiXrkMEo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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