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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4cbf4e152824bec81704b995328e11073aa2ae042a166ac10b34e4fcf60eba89' 
  AND token = '71CMF3HvgAHfyNJEo/YG5osx2U65S+dD6oQf58c+M5Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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