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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'deea87b874490e9c0e51e5e1c07fb50e1fba3a65ebbd6e202885c153f032ca42' 
  AND token = '6yvdK6ReKKpa0V0I7LcknmGKLV/BlsNZG9tlF829y5A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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