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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07868308e880db464949e87784914f9d8ca5db41752ad128e0f9543527b54957' 
  AND token = 'lMDShHyEhahj3tRTddkD0dYPoqZg7eirNUQZq80EFeI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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