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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1f5ed0a79fcf962852a0e058554f9caec32fc828bc0ba03c0247e1817dc3245' 
  AND token = 'zc3UnkAOXdf9LolvhhLJrIMMKe3jDuWmjOjg858tflk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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