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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bfaf6d9178c5d93fcf1b2264b08f31ac7f4078358ddacb5da8043f78772dbdf0' 
  AND token = 'IFjz68X/Qd07kjmkkMXK6ORGSqWIKvEBFzaSMkSmVoU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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