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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e0bc1a754afaa7b782e11b7541e4939218335f0598601395aec6bfe0d5874b4' 
  AND token = '/Tq/qgJSz3B6Clzq53tlbKHP1o4siHc5aj0bdCYzWV0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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