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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc71a66a8327e61a4ff32028d8b4bbd281bdd16fc37f646233fe381152396584' 
  AND token = '9Sv2h8P6JmZ7ekzeL61RTxHcl0doR9DisUa4A8ZguFk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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