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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '566ee6a012754fd1909db7ce84a7eadf80733f5c042a7ff40f5a16877ec5785c' 
  AND token = 'GcgWY6nnnPef1JdvtJnAlW0p2Y30aYPC1PLmLrlnW28=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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