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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9d4f566d7ec3b6575a1035d4cc11511e76184974649e500144ca8d7a4c6c624' 
  AND token = 'KMNI7eNLlRSiwB1GBkqX6mRgC9oLPVja2+PI0hMbcdY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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