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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '64ef91ce0be6f6ede2f3ae0502467773fb9eddfb8ebacd112f3753304667381e' 
  AND token = 'EywK33P00zAnE9LYpr2+3z8U74NVqfKejlWTjnLgjDI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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