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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7af879433e5773130d02183bcab2fe7fb7b9beb37d8410c94ac9054390f81ae' 
  AND token = 'SHv7Lp6XOGH9PyjbCOF+oNE/re8bsIT3Iuez5W9x5GU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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