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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf03ace65b6b4bec58fefce95533e9c5f7fd0cc166a1f6f9aea5f204fd54a8df' 
  AND token = '+0aSmVV5y2YuMw/Inrp53UXEo8qeFHg4KS5of7Qgngs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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