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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b4d897af7bae3d08a0f191c8c172510d510787090ef65f14bd60a7888758025d' 
  AND token = 'WlItvoFU4rtwd034pdXoN6wRRGvf5VUZ1Axs3OenBq0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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