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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a93be5e9f0fd8455befaddf2b66c826442c417f1a9ff3ddd409d8861dbcd8757' 
  AND token = '0ibUB+0OwKho5zaQ2xmqwa45nF63ZLtwTqQw9Mycs1s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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