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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '908d55b0fe561ac510773b3a4ffce916a6a7cb9b7acea496b3000f50e3971e5e' 
  AND token = '1dADHNr0Pa0atTCoFDiFGqZCgrci/1Ky9xiLaAKCyzE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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