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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '509313153e2165272e03c2caf77b2ec6daff5e2b06dd17e71d02bedf58716d55' 
  AND token = 'lGp1XYTcpxN5JjEqI5Ktj9ZfnnfgUeoTyt0ndc0Oh28=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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