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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f75676395e00452c34a4fcc4b71112219af75bb5d5cc572bf918d61b34fab71e' 
  AND token = 'miG2nfLn0I7XE0748OCk9s1lD4mcYn3OdHNSRIbXXNE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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