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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd81ec3fd1e71c91b071f4ca18edff1b1c2750d4612a72c16833a9633afcac1e' 
  AND token = '7Q520E2JACpCxs2qyVAyAIu8VjahOn85hkGnB47TKH4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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