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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '20cb9c3a9c8a65ca1dd28963d2ad0ac599ed607b34d01cb640119f2d34033b20' 
  AND token = '/gNRSx2PTXu5n56nY9DmU2P7gEys+AIBMF7G4/r0CiQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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