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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99678c3b2e8af15a12155c4d8624a3790b7bcc917717900a32092420bc12f155' 
  AND token = '+LrPRhzHo2atJSKaF+F7BEnLtQDCY8GudHjCQ1SYkAQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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