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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9cfc95a941aa607fdc4a17836ec28d9932336b5a03974397b0c4fff7a61eb18f' 
  AND token = 'TNg/He+b4XeDPcJshcLOmuMNPS07FZSuQ/zCIaD+vHo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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