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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '825f89e4b2d68f7a11785fdda99362b047d7643e68bbc7a20df6c9eb8f02f6d1' 
  AND token = 'tkX3DG/LQ/hBJy2PkxMOcxvQ8c9ClkfPOb6MgE8kaP0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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