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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab383c0bd750e161056b212dd12d52ad319faba1fe61bbf5389a1c11323e2e89' 
  AND token = '4urB8+iof3X+coMleqHS2YJXIa48bpV6fTtEYyA2Eec=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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