SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bbc2dc7b4864441d87715ae384c5992ba17d98815e1ce928bf4f4f34c66005dd' 
  AND token = 'HhUrS07VPzGTJAv/R+hXqgPaRfnLY8eH4SsEUWLR1K4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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