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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a25ba2921c2e57a21a782189e9f4d9fd197e772b42f57dcd951d3bb780a6cba' 
  AND token = 'TEc8mmaqjPbCuCgX7L0Rwel3MWz7wVzsP2cdWj6R62U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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