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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a83aed4b2f5ac93c29e42cf2307c7da7ed6db9937aa50bd174514ae3751afea0' 
  AND token = 'kGwdwBOa3Aar4G3ejNvVV/cZQxU9/ZS6ozEkfUyXw2Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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