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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83e5e5fba9a1d77c42a152e37813bfba10e8bd2e260430040775a601774aa81c' 
  AND token = 'a0jW/jSRy8Pp5MY8i6BkWlSe+UAWPsp9QrrCHstFAGI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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