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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e09294158364eec902dde04a4bc7c712dacb816128a6019e28c4000a1d9dcebc' 
  AND token = 'NaYdLzisCxqSIxbSl0PB1sBS1mck2zJ1I48tC4l6q4c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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