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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89ed0dc2cc85b04c3d943bf5ff54a1587c81cfb2f029ba8b64af8c9a03c3c830' 
  AND token = 'OjhIbOXE9LtBLps/8hAK+g4NutK9ccHm8K79k+vBAlw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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