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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee84f371673993f3ac77b3b482df1c3c3ee6dd873a503350d199bd4f34b58f06' 
  AND token = 'NE5bWH15ok5EGqPThgX7/A4YmyrO+uKDVDky4LHGp9g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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