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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4d28958ee5153a4013ea70c1c04c0b5fc1bee76b737cd45967e995cb3b99db83' 
  AND token = 'fVcSeH70Z1nRbsP2sXR2HGkWq0Z2pGotILx8I69tRQo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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