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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e3634310c96110d0d00da5a795a235a5b7e7a91a25863c49053e9260b0d9518d' 
  AND token = 'S04uEq0Tsuo2Xafnn7FkQLo+7brYHkwmwT79uwRkT1c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00061

JSON explain

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