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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'de292d49aaded5e816d27f4d764c29b7aae626234c4cb5cd0cdfbebc066d3603' 
  AND token = 'ZPYNiR7uoZz4R1k2qkXdHUMRsH9lYMuypUEvZEhrX4A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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