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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3bc5d3229e56ff8d93c3070cb706f606f0aa48b4034e94a6930be509f8cca67b' 
  AND token = '1MK4gYlUxf9bcxxvP9V4NUVzbh7zb895H1spLrux1g4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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