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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3dc25b49c39199ca01b572e2755f51e1fa3cd8fd157ad99b82189a6a2cf6308e' 
  AND token = 'lkZzsr9HceVX3ide62H8bCiY3hDc6Rwe87nNM7vb24s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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