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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c38f6aebe5307181b0f87ff052d794c4d30b05fd0f68eccce82edfb4952282c8' 
  AND token = 'Z+k0EnpazgnCuRiav4vnYphlzByMsRjs/sQQBg5D8i4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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