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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f5b97771a58fdeb266cd3d8924c067e062f7ea3c2bbda3bdae430ca2150ceb7f' 
  AND token = 'LC6tN0KhueENn7hVT+C/7rmjhmRPny8AN3gWwHiffo0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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