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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c621545cc4c3cfcfd94e2f25a86475dc8c3986d350b62710a7a1c6e2f8dcfc54' 
  AND token = 'WGnu3Py77Fxee8XvOoEEQorbMb51M9DiYknjqXaMH9o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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