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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ea04215d2d4f24921203f6b2862dff54527088994f9c4a41882824b0ff6aa5c' 
  AND token = 'J1p/lMzY6ryADu6DmRhKmUcxn8jPGbOTfmTBPe4O/NQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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