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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e6ba9dcdf178f58f734be5cd0e8d772d8db772f2f0ea4bfbadcfda326d9a1461' 
  AND token = 'ZBxCqvAshZg0SPUFklptN2U1PV3hxN1NKjQmD0lI3ec=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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