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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db0a987450d93d4c44595d457a22071ff67776aa880acc5f2f93964de9b884bb' 
  AND token = 'PYRmIIrwRMa8mYCaJbIA4Hr5bHazfZ86mELnIebCwNo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00060

JSON explain

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