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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b405894924a2a7d3a21a2cab4b951c02f576884d758377543cdc4221fe671ee2' 
  AND token = '00DKwKAZcrOSClm7S+PUKZpvVKB9iDtEoSGXgs9cDoc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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