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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf9be8a6eacb79dac15f763cb1698baa81e06e0bfa6f734f4b59546e366f09d9' 
  AND token = 'ZEXYWtgafg4ibojOS+P/ZP3r+1Hxf/q6fTka5S3RGFc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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