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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '54061b6057411856e862143efd9fd32bcaf076789e382d64ac8846f840b274fd' 
  AND token = '92eYS8bHlZPxLriLn+/riD/rP+TS+oi9XinCdYlcIQc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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